RE: P2 rockers and......spacers???
Ya if you don't have them on its not gonna give the full progessive-ness?..heh.. So ya should be softer. And P3 are even more stiff.
The progressive is when you push down on the suspension.. how for at goes down before you feel the greater amount of resistance.
For example a P1 you may be able to push the suspension nearly all the way down before feeling the most resistance at the last inch. A P3 when you push down you may feel the most resistance at the last 3 inches. Just an example,